Sinclair SCV-EB Series Service Manual page 66

Outlet water temperature sensor (Tw_out) / total
outlet water temperature sensor(T1)/ balance tank
temperature sensor(Tbt) connection on hydro system
Pressure sensor has short-circuited or failed
Replace refrigerant system PCB
Notes:
1. Low pressure switch connection is port CN17 on the refrigerant system PCB.
2. An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and suction pressures to be lower than normal
and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. These issues disappear once sufficient refrigerant has
been charged into the system.
3. A low pressure side blockage causes compressor discharge temperature to be higher than normal, suction pressure to be lower than normal and compressor
current to be lower than normal, and may cause frosting to occur on the suction pipe. For normal system parameters.
4.
Outlet water temperature sensor (Tw_out), total outlet water temperature sensor(T1), balance tank temperature sensor(Tbt) connection is port CN6 on the
hydro system PCB.
5. Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor
has failed.
64
4
PCB is loose
No
No
Ensure the temperature sensors are
Yes
Yes
5
connected properly
Replace pressure switch